2006: Gnarls Barkley's 'Crazy'

Along with OutKast's "Hey Ya!" this was quite possibly the most ubiquitous song of the decade. Rapper Cee Lo Green, working with hot producer Danger Mouse, was remade into a soul singer, and the resulting sounds of the single are all over the place. Lyrically, this is a paranoid freak-out, but...

Along with OutKast's "Hey Ya!" this was quite possibly the most ubiquitous song of the decade. Rapper Cee Lo Green, working with hot producer Danger Mouse, was remade into a soul singer, and the resulting sounds of the single are all over the place. Lyrically, this is a paranoid freak-out, but... (Liz O. Baylen / Los Angeles Times)

Along with OutKast's "Hey Ya!" this was quite possibly the most ubiquitous song of the decade. Rapper Cee Lo Green, working with hot producer Danger Mouse, was remade into a soul singer, and the resulting sounds of the single are all over the place. Lyrically, this is a paranoid freak-out, but...